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# Copyright 2018 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
Rule that allows to embed binary files into a C++ program.
The result is exposed as an absl::string_view global variable.
"""
def cc_data_blob(name, src, varname):
native.genrule(
name = name + "_sources",
srcs = [src],
outs = [name + ".cc", name + ".h"],
cmd = "; ".join([
"cat $< > $(@D)/datablob.tmp",
"pushd $(@D)",
"outname=%s" % name,
"echo 'namespace {' > $$outname.cc",
"xxd -i datablob.tmp >> $$outname.cc",
"echo '}' >> $$outname.cc",
"echo '#include \"absl/strings/string_view.h\"' >> $$outname.cc",
"echo 'absl::string_view %s(reinterpret_cast<const char*>(datablob_tmp), datablob_tmp_len);' >> $$outname.cc" % varname,
"echo '#include \"absl/strings/string_view.h\"' >> $$outname.h",
"echo 'extern absl::string_view %s;' >> $$outname.h" % varname,
"rm datablob.tmp",
"popd",
]),
)
native.cc_library(
name = name,
srcs = [name + ".cc"],
hdrs = [name + ".h"],
deps = ["@com_google_absl//absl/strings"],
)